CN112613148B - Nuclear power equipment design method based on numerical analysis deformation data - Google Patents

The invention discloses a nuclear power equipment design method based on numerical analysis deformation data, which belongs to the technical field of nuclear power equipment. According to the invention, the accuracy characteristic analysis module program is added in the numerical calculation software, so that the mounting surface deformation data in the research process can be regulated, and the technical support is provided for the accuracy design, thereby effectively improving the efficiency and quality of the research and development of the nuclear power equipment, and solving the accuracy analysis problem in the design process of the nuclear power equipment.

Nuclear power equipment design method based on numerical analysis deformation data

Technical Field

The invention relates to the technical field of nuclear power equipment, in particular to a nuclear power equipment design method based on numerical analysis deformation data.

Background

Along with the development of nuclear electric energy industry, the development requirements on large-scale nuclear island main equipment are increasing, such as a reactor pressure vessel, a material changing device and the like of a third-generation pressurized water reactor, a fourth-generation sodium-cooled reactor, a lead-bismuth reactor and a molten salt reactor. The nuclear island main equipment is mainly developed and designed by adopting an analysis design method, and the analysis design is mainly based on the specification of the third volume ASME BPVC, RCC and other standards for evaluating the stress of the container; the domestic numerical analysis process mainly follows the general rule of finite element mechanical analysis of the structure of GB/T33582-2017 mechanical products, finite element analysis and calculation are carried out on the structure, but the numerical calculation software post-processing program has no analysis and evaluation method of accuracy characteristics.

The precision problem needs to be considered in the nuclear power equipment design process. For example, the main nuclear island equipment mainly comprises a nuclear reactor pressure vessel, a refueling device and the like, and the structure is shaped mainly by a numerical calculation method in the research and development design stage. The current general numerical calculation processing software, such as ANSYS, MARC, ABAQUS, mainly comprises the following analysis processes: establishing a physical model, establishing a finite element discrete model (preprocessing), forming and solving finite element equations, and explaining and displaying results (post-processing). The function of the post-processing program is to further process and graphically display the calculation result which is indicated to be output by the user in the pre-processing program. The display mode of the displacement calculation result in the post-processing generally comprises the following steps: contour line display, cloud image display, vector display, path display, history display, and the like. In the research and development design process of nuclear power container equipment, a designer needs to perform qualitative evaluation on the installation accuracy characteristics of a container interface. In the design process of a third-generation-type Hua-Long nuclear reactor pressure vessel, the flatness of an equipment installation surface of a reactor internal component needs to be evaluated; for example, the four-generation reactor type nuclear reactor pressure vessel such as a sodium-cooled fast reactor, a molten salt reactor, a lead-bismuth reactor and the like needs to be subjected to precision evaluation on installation surfaces of equipment such as a large-scale bearing, a refueling device, a steam generator and the like. The geometric shape position errors of the installation surface of the equipment cannot be analyzed in the traditional post-processing program of the general numerical calculation processing software.

Disclosure of Invention

The invention provides a nuclear power equipment design method based on numerical analysis deformation data, which is characterized in that a precision characteristic analysis module program is added in numerical calculation software to realize calculation and analysis of the precision characteristic of nuclear power equipment in the nuclear power equipment design process, and the nuclear power equipment design method is a convenient post-processing method of the numerical calculation software, can prescribe the mounting surface deformation data in the research process, and provides technical support for precision design, thereby effectively improving the efficiency and quality of nuclear power equipment research and development and solving the precision analysis and evaluation problem in the nuclear power equipment design process.

In order to solve the technical problems, the invention adopts the following technical scheme:

a nuclear power equipment design method based on numerical analysis deformation data comprises the following steps:

step 1: establishing a numerical model for nuclear power equipment and performing numerical calculation to obtain a numerical calculation result;

Step 2: extracting an equipment installation surface with precision requirements according to nuclear power equipment design input, and determining geometric characteristic elements of the equipment installation surface;

Step 3: defining a reference standard of precision evaluation;

step 4: extracting the nuclear power equipment installation surface geometric feature element node deformation displacement information from the numerical calculation result;

step 5: aiming at the precision characteristic requirement of the installation surface of the nuclear power equipment, determining the requirement of precision evaluation, and establishing a precision characteristic evaluation model;

Step 6: carrying out data fitting on the deformed elements by adopting a least square method, and carrying out fitting element parameter identification at different moments;

step 7: calculating the precision characteristics of the equipment installation surfaces at different times according to the precision characteristic evaluation model;

Step 8: judging whether the precision characteristic meets the requirement of a precision allowable value of the structural design, if the precision characteristic does not meet the requirement, returning to the step 1, modifying the numerical model and carrying out numerical calculation again;

Step 9: and if the precision characteristic meets the requirement, ending the calculation, outputting a calculation result and forming a calculation report.

Preferably, the precision characteristic evaluation model includes: a shape accuracy model, a direction accuracy model, a position accuracy model, and a runout accuracy model.

Preferably, the shape accuracy model includes straightness accuracy characteristics, flatness accuracy characteristics, roundness accuracy characteristics, cylindricity accuracy characteristics, line profile accuracy characteristics, and surface profile accuracy characteristics;

The direction precision model comprises parallelism precision characteristics, perpendicularity precision characteristics and inclination precision characteristics;

the position accuracy model comprises position accuracy characteristics, concentricity accuracy characteristics, coaxiality accuracy characteristics and symmetry accuracy characteristics;

The runout precision model comprises a circle runout precision characteristic and a full runout precision characteristic.

Preferably, step 1 comprises:

step A: extracting the precision form and position tolerance requirements of installation surfaces of all the equipment according to the design input of the nuclear power equipment, and taking the precision form and position tolerance requirements as allowable values of structural design precision;

and (B) step (B): establishing a geometric model according to a nuclear power equipment design input drawing;

step C: inputting material properties of nuclear power equipment, applying mechanical and thermal loads and constraint boundary conditions, and determining a computing unit;

Step D: establishing a finite element discrete model according to the geometric model, and dividing grids to form a numerical model;

step E: determining an analysis solving method aiming at the calculation purpose, and calculating a time step under the condition of meeting convergence, calculation precision and computer resources;

Step F: solving and calculating the numerical model to obtain deformation calculation results at different moments;

step G: and (5) carrying out grid quality and sensitivity analysis, and ensuring the accuracy of grid division.

Preferably, in the step B, the geometric model is simplified, and the detail characteristics of the geometric model according to the edge angle, the small boss and the small groove of the structure are considered on the premise of ensuring the finite element analysis precision of the concerned part.

Preferably, in the step D, when the grid is divided, the area where the stress is slowly changed is coarsened, and the area where the stress is rapidly changed is refined.

Preferably, the analytical solution method comprises a static analysis method and a dynamic analysis method.

The invention has the advantages and positive effects that:

1. according to the invention, the accuracy characteristic analysis module program is added in the numerical calculation software, so that the mounting surface deformation data in the research process can be regulated, and the technical support is provided for the accuracy design, thereby effectively improving the efficiency and quality of the research and development of the nuclear power equipment, and solving the accuracy analysis problem in the design process of the nuclear power equipment.

2. The invention solves the problem that the geometric shape position error of the installation surface of the equipment cannot be analyzed in the traditional post-processing program of the general numerical calculation processing software.

3. The invention is a convenient post-processing method of numerical calculation software, and the precision characteristic calculation analysis is used as an extension of the analysis and evaluation of the design stress of nuclear power equipment, and the method is simple and has strong operability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.

FIG. 1 is a flow chart of a nuclear power equipment design method in an embodiment of the invention;

fig. 2 is a schematic diagram of a precision extraction position and a precision analysis of the nuclear power equipment.

Detailed Description

The invention discloses a nuclear power equipment design method based on numerical analysis deformation data, which is developed aiming at the fact that geometric shape position errors of equipment installation surfaces cannot be analyzed in a traditional general numerical calculation processing software post-processing program.

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

As shown in fig. 1, the embodiment of the invention provides a nuclear power equipment design method based on numerical analysis deformation data, wherein a nuclear power equipment design system comprises a preprocessing and solving module and a precision characteristic post-processing analysis module, and the nuclear power equipment design method comprises the following steps:

Step 101: extracting the precision form and position tolerance requirements of installation surfaces of all the equipment according to the design input of the nuclear power equipment, and taking the precision form and position tolerance requirements as an allowable value of structural design precision;

step 102: establishing a geometric model according to a nuclear power equipment design input drawing;

in the specific implementation, the geometric model is simplified, and on the premise of ensuring the finite element analysis precision of the concerned part, the detail characteristics of the geometric model such as the edge angle, the small boss, the small groove and the like according to the structure are considered as far as possible;

step 103: inputting material properties of nuclear power equipment, applying mechanical, thermal load and the like and constraint boundary conditions, and selecting a proper computing unit;

step 104: establishing a finite element discrete model according to the geometric model, and dividing grids to form a numerical model;

Coarsening a slow stress change area and refining a rapid stress change area when dividing the grid;

Step 105: determining an analysis solving method aiming at the calculation purpose, and calculating a time step under the condition of meeting convergence, calculation precision and computer resources;

The analysis solving method comprises the following steps: a static analysis method and a dynamic analysis method;

step 106: solving and calculating the numerical model to obtain deformation calculation results at different moments;

Step 107: performing grid quality and sensitivity analysis, and ensuring accuracy of grid division;

the steps 101-107 realize that a numerical model is built for the nuclear power equipment and numerical calculation is performed, so that a numerical calculation result is obtained.

Step 108: extracting an equipment installation surface with precision requirements according to nuclear power equipment design input, and determining geometrical characteristic elements of the installation surface;

step 109: defining a reference standard of precision evaluation;

step 110: extracting the nuclear power equipment installation surface geometric feature element node deformation displacement information in the numerical calculation result;

step 111: aiming at the precision characteristic requirement of the installation surface of the nuclear power equipment, determining the requirement of precision evaluation, and establishing a precision characteristic evaluation model;

wherein the precision characteristic evaluation model includes: a shape accuracy model, a direction accuracy model, a position accuracy model, and a runout accuracy model.

The shape precision model comprises straightness precision characteristics, flatness precision characteristics, roundness precision characteristics, cylindricity precision characteristics, line profile precision characteristics and surface profile precision characteristics;

The direction precision model comprises parallelism precision characteristics, perpendicularity precision characteristics and inclination precision characteristics;

the position accuracy model comprises position accuracy characteristics, concentricity accuracy characteristics, coaxiality accuracy characteristics and symmetry accuracy characteristics;

The runout precision model comprises a circle runout precision characteristic and a full runout precision characteristic.

Step 112: carrying out data fitting on the deformed elements by adopting a least square method, and carrying out fitting element parameter identification at different moments;

Step 113: calculating the precision of the equipment installation surface at different moments according to the precision characteristic evaluation model, namely the precision characteristic;

As shown in fig. 2, the precision extraction position 1 is shown in the figure, the solid line is the actual profile curve of the evaluation position, the broken line is the fitted profile obtained by the least square method, d1 and d2 are the distances between the actual profile curve and the two sides of the fitted profile, and the sum of the two is the precision characteristic.

Step 114: judging whether the calculation accuracy characteristics meet the design input requirements, if not, returning to the geometric physical model of the nuclear power equipment, and modifying and recalculating;

step 115: if the requirement is met, the calculation is finished, the calculation result is input, and a calculation report is formed.

In conclusion, the method solves the problem of precision analysis in the nuclear power equipment design process. The invention relates to a convenient post-processing method of numerical calculation software, which is characterized in that an accuracy characteristic analysis method is used as an extension of analysis and evaluation of nuclear power equipment design stress, an accuracy characteristic analysis module program is added in the numerical calculation software, and the deformation data of a mounting surface in the research and development process can be regulated, so that technical support is provided for accuracy design, and the efficiency and quality of research and development of nuclear power equipment are effectively improved.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.